34 21 320 Removing and installing or replacing both rear brake discs

Special tools required: 

• 34 1 280

Necessary preliminary tasks: 

• Remove Wheels
• Remove and clean Brake Pads 

After completing work:

• Adjusting Handbrake 
• Read and comply with Notes On Braking In New Brake Discs / Brake Pads. 

Check minimum brake disc thickness:

• Position special tool 34 1 280 at three measuring points in area (1) and measure.
• Compare measurement result and lowest value with Setpoint Value.

New brake pads may only be installed if the brake disc thickness is greater than or equal to the Minimum Brake Disc Thickness (MIN TH).

If the brake discs are replaced, you must also fit new brake pads.

Always replace brake discs in pairs.

Fig 1: Identifying Special Tool (34 1 280) And Measuring Points

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1). Remove and suspend brake caliper from vehicle.

Installation: 

For tightening torque refer to 34 21 2AZ in 34 21 REAR BRAKE .

Fig 2: Identifying Brake Caliper Mounting Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1) and remove brake disc (2).

Installation: 

Replace screw.

For tightening torque refer to 34 21 1AZ in 34 21 REAR BRAKE .

Fig 3: Identifying Screw And Brake Disc

Courtesy of BMW OF NORTH AMERICA, INC.